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JACOB G.;CROCKETT, OF,j PORTSMOUTH, NEW HAMPSHIRE, ASSIGNOR 'lOIIIMSELF, JOHN J. FLANDERS, AND JOHN W. HAYES."`

Letters Patent 64,75), dated Mag/'14, 1867.

IMPROVEMENT IN BALANCE-unseren STEAM ENGINES.

Be it known that I, JACOB GoonwIN Cuocrinrr, of Portsmouth, Rockinghamcounty-', State ofl New Hampshire, have invented certain new and usefulImprovements in Balance-Valves for Steam and other Engines; and I dohereby declare the following description and accompanying drawings aresufficient to enable any person skilled in the art or science to whichit most nearly appertains to make and use my said invention orimprovements without further invention or experiment. .Y

The nature vof my invention and improvements consists in thearra'ngementof two valves on the same shaft or rod, so that said shaft or rodshall'hold said valves against the pressure of the steam, and relievethe valveseats from the pressure of the valves; and in an arrangement,of devices to traverse one of the valves hon the shaft, to adjust bothvalves to their seats; and in' the arrangement of the valves wherebythey balance each other, and work 'over the ports or ways on the two'opposite sides of a4 steam chest; also a. steam chest with a secondsteam chest or box within it, with induction and eduction ports or ways,or both, for the steam to pass through. Inthe accompanying drawings-4 IFigure 1 is a plan of a steam chest with the valves in it.

Figure 2 is a section on the line z z of iig. 1. A

Figure 3 is a section on the line y y of fig. I.

Figure4 is a section of the valve-rod or shaft.

Figure 5 is a plan and section of one of the valves.

In these drawings, 'A is a steaml chest or box, which may be placed'onthe side or top of the cylinder.

Within the chest A there is a second steam chest or box, B, passingcentrally across it, and provided with.

induction and eduction` ports or ways on cach side, and with a smallexhaust-box, C, arranged on Oneach side of the box B there arel fourinduction ports D D D D,.for supplying steam to the cylinder, andeduction 'ports E E between the induction ports D D. Both the steamchests are perforated forthe shaft F, which passes through them, and isprovided with stuffing-boxes G G. Two valves, H H', are arranged uponthe shaft F,'the' valve H being rigidly fastened to the shaft, and thevalve H arranged to traverse freely on it, but not turn except with theshaft. These valves .are so constructed as to balance each other, andrelieve the valve-seat partially or entirely from friction. Each of-thevalves, H and H', is so constructed as to cover both of the eduction andtwo of the Vinduction ports on each side of the chest B, each wing ofeach valve being provided vwith an exhaust-spaceor cavity, El, on itsunder side. When the valves are in the position shown in fig-1 the,steam enters the induction vports D D, and vpasses to the cylinderthrough the passages I I, while the exhaust steam escapes through theports D D\into the exhaust-space J under the valve, and from thence intothe eduction ports E E, and from thence through the exhausbpassages K,and through the eXhau`st-boX C to the waste pipe or condenser. Thevalves H Hma'y be moved, by some convenient device applied to the shaftF, so as to shut the steam from the cylinder, as a cut-off, and tosupply the opposite end of the cylinder from what was-'supplied at theprevious stroke, and exhaust from the end rst' supplied. Two inductionports on each side of the steam chest B are open at the same time, andconnected by the passages I to one endof the cylinder. The other two onthe other side of the steam chest B are connected by the passage I,shown in dotted lines. To`adjust theA valves to theirseats I make-theend of the shaft F hollowto a little beyond the valve H', and fitthe :od L to it to traverse freely init, and apply a stuiing-hoX, M, toprevent the steam from escaping around the rod L. l I make a slot in theshaft F, so that thev key N, which keys the valve H to the rod L, cantraverse with the rod and valve H.. I cut a Screw on the endof the rodL, and the nut P to it. The shaftF is grooved rounds wise, near thestuiing-jbox' M, for the collar Q to turn in, whichecollar is fnade intwo parts, and connected by four bars tothe collar R,`which is also inVvtwo parts. These collars are held together. around the shaft by thescrews S S.' The nut P, on the end of the rod I., is i'tted to a mortisein the collar R, so that, by turning the collars R and Q, `the rod L maybe traversed in the shaftl F, to move the valve Hi, which is keyed tethe rod, s o as to adjust the'valves H andH to their seats, so that theymay work with very little, if any, pressure or friction. The rod L isprevented from turning in the shaft F. by the key Ngvwhich connects itto the valve H.

One side of the nut P is sawed open, and the clamping-screw T is fittedto it to clamp the nut on the screw, and prevent it from turning'whenthe valves are properly adjusted.

In the foregoing description I have shown my balance-valves working onthe outside and on the opposite sides of the steam box B; but Icontemplate that they may be reversed ou the shaft so as to work overports on the opposite sides of a box on` the inside, and that the portsor passages foi; the steam may be made in the sides of the said box,similar to those described in the box B. When arranged in this Way thevalves balance each other as perfectly as in the mode previouslydescribed, and the nut,`rod, and collars will adjust them to their seatsas Well as before. Au arm may be-applied to theshaft to work 'the-valveson the port H; and, when so made, the shaft need not enter or passthrough the opposite side of the box A. I have described the valves asheilig made with `exhaust-spaces; but they may be, made Without suchspaces, if preferred that way.` I have described my improvements asapplied to Working steam, but contemplate that valvesbalanced in thesame way may be used for water and other liquids or fluids.

A Having described my improvements, I elaim- The arrangement of twovalves on the same shaft, sothat the shaft shall hold the valves againstthe pressure of the steam, and relieve the valve-seats from the pressureof the valves, substantially as herein set forth.

I claim the devices described for traversing one of the valves on theshaft to adjust both to their seats, substantially as described.

JACOB GOODVIN CROCKETT.

Witnesses:

FRANCIS BAcoij, Gno. W. TowLn.

